Stair tread surface



FIG. 1 is a perspective view of a stair tread surface showing my newdesign:

FIG. 2 is a top plan view of the stair tread surface of FIG. 1;

FIG. 3 is a side elevation view of the stair tread of FIG. 1; and,

FIG. 4 is a perspective view of another embodiment of the stair treadsurface.

The broken line showing the nose and the back bevel is for illustrationonly and forms no part of the claimed design.

The ornamental design of a stair tread surface, as shown and described.